Bookmark

Quantum Physics

Title:Ghostly action at a distance: a non-technical explanation of the Bell inequality

Abstract: We give a simple non-mathematical explanation of Bell's inequality. Using the
inequality, we show how the results of Einstein-Podolsky-Rosen (EPR)
experiments violate the principle of strong locality, also known as local
causality. This indicates, given some reasonable-sounding assumptions, that
some sort of faster-than-light influence is present in nature. We discuss the
implications, emphasizing the relationship between EPR and the Principle of
Relativity, the distinction between causal influences and signals, and the
tension between EPR and determinism.

Comments:

12 pages, 5 figures, revised version, to be published in American Journal of Physics